import { fabric } from 'fabric';
import extend from 'tui-code-snippet/object/extend';

/**
 * Cached selection's info
 * @type {Array}
 * @private
 */
let cachedUndoDataForChangeDimension = null;

/**
 * Set cached undo data
 * @param {Array} undoData - selection object
 * @private
 */
export function setCachedUndoDataForDimension(undoData) {
  cachedUndoDataForChangeDimension = undoData;
}

/**
 * Get cached undo data
 * @returns {Object} cached undo data
 * @private
 */
export function getCachedUndoDataForDimension() {
  return cachedUndoDataForChangeDimension;
}

/**
 * Make undo data
 * @param {fabric.Object} obj - selection object
 * @param {Function} undoDatumMaker - make undo datum
 * @returns {Array} undoData
 * @private
 */
export function makeSelectionUndoData(obj, undoDatumMaker) {
  let undoData;

  if (obj.type === 'activeSelection') {
    undoData = obj.getObjects().map((item) => {
      const { angle, left, top, scaleX, scaleY, width, height } = item;

      fabric.util.addTransformToObject(item, obj.calcTransformMatrix());
      const result = undoDatumMaker(item);

      item.set({
        angle,
        left,
        top,
        width,
        height,
        scaleX,
        scaleY,
      });

      return result;
    });
  } else {
    undoData = [undoDatumMaker(obj)];
  }

  return undoData;
}

/**
 * Make undo datum
 * @param {number} id - object id
 * @param {fabric.Object} obj - selection object
 * @param {boolean} isSelection - whether or not object is selection
 * @returns {Object} undo datum
 * @private
 */
export function makeSelectionUndoDatum(id, obj, isSelection) {
  return isSelection
    ? {
        id,
        width: obj.width,
        height: obj.height,
        top: obj.top,
        left: obj.left,
        angle: obj.angle,
        scaleX: obj.scaleX,
        scaleY: obj.scaleY,
      }
    : extend({ id }, obj);
}